Apparatus for cutting grass in connection with paper making



March 26, 1929. s. MILNE 1,706,935

APPARATUS FOR CUTTING GRASS IN CONNECTION WITH PAPER MAKING Filed May 26. 1925 1lars'detachably mounted on each shaft, the.

Patented Mar. 26, 1929.

{UNITED STATES. PATENT OFFICE.

SAMUEL MILNE, on EDINBURGH, SGQTLAND.

APPARATUS FOR CUTTING GRASS IN CONNECTION WITHPAZPER MAKING.

Application filed May 26,1925, Serial No.

This invention relates to apparatus-for knives on one shaft overlapping the knives on the other shaft so as to co-operate to cutzthe grass, means for drivingthe knives and means for clearing the spaces between the knives. The knives are all adapted to turn with their respective shafts and if de sired one knife only may be fixed longitudinally whilst the others are free to move endwise. Preferably one only of the shafts is driven and provision is made to adjust one or both of said shafts endwise to on sure thatthe cutting edges of the knives are kept in .close contac v i j The accompanying drawings illustrate one form of the invention, in which:

Fig. 1 is a plan, and Fig. 2 is an enlarged section showing the arrangement of the knives andclearers.

Fig. 3 is a diagram showing the relative position of the gearing.

As illustrated, the improved machine (our prises two parallel shafts a, each fitted with a series of toothed disc knives 0, with intermediate spacing washers, the knives on the shaft a overlapping the knives on the shaft 1) so as to co-operate with them to cut the grass by a shearing action, see Fig. 2, the width of the knives determining the length of the cut grass.

The knives, which are serrated as shown, are keyed to their respective shafts, one end knife being fixed and the other knives being slidably adjustable thereon. The shafts a and b are mounted in. bearings d, a suitable means being provided for lateral adjustment of the knives, such as a. lateral adjustment screw 6 for the shaft Z), the fixed knife on the two shafts being at opposite ends. Arranged below the two shafts a; and I) are two parallel shafts f on which are mounted rotary clearers, the arms of which are arranged to enter the spaces between the knives and remove any grass remaining therein. The two shafts fare mounted in 33,039, and in Great Britain April 3, 1925.

the bearings (Z and are geared together at one end by pinlons Ill The shaft (14 is arranged to be driven by suitable gearing j and 70 from a countershaft in and on the shaft a is a pinion w,

meshing with a low the shaft 6.

The knives are changeable so that broader or narrower knives may be used to vary the length of the cut grass, and the clearer-s pinion 0 on theshaft f beand spacers between them will be similarly changeable; r i i i In operation the shaft a. and the clearers g are driven, the knives on the shaft 6 are adjusted intocontact with the knives on the shaft a-and will be thereby rotated, nonrotation of lthejshaft b generally being an indication that the knives are not closely enoigh adjusted. The serrations on the knives of the shaft m grip the grass and carryitdown on to the knives of the shaft Z), each knife shearing off lengths of grass between the adjacent knives on theopposite shaft. Ihe,clearers g, whlch are driven aboutb to 1 fronrtlie shaft a, enter the spaces between the-knives and pull out any grass which has not" fallen out below as the knivesseparate. *Owing to the contactbe tween the cutting edges ofthe knives there is -a slight but appreciable wearing action which,wherebothknives are driven, causes the faces of the knives to become grooved by the teeth of the engaging wheel. Such grooving does not occur when only one knife shaft is driven, as the knives slip a little and distribute the wear evenly, the edges becoming highly polished and the knives maintaining their sharpness.

What I claim and desire by Letters Patent is 1. A machine for treating grass in con nection. with paper making, comprisingtwo shafts, double-edged toothed circular knives and intermediate spacing collars detachably mounted on each shaft to rotate therewith, the knives on one shaft overlapping the knives on the other shaft so as to co-operate as shears to cut the grass, means for driving at least one of the shafts and means for clearing the spaces between. the knives, com.- prising rotary clearers, mounted below each knife shaft, having tapered forwardly curve-d arms arranged to enter the spaces between the knives to the full depth thereof, the arms of the adjacent clearers overlapping, as set forth.

2. A machine for treating grass in Vconnection wi-thpaper making comprising two f grass, means for maintaining the operative facial engagement ofthe knives, means for driving at least one of the shafts and means .for clearing the spaces between the knives,

' comprising rotary clearers, mounted below eachzknife shaft, having tapered forwardly curved arms arranged to enter the spaces between the knives to the full depth thereof, the arms of the adjacent clearers overlapping, asset forth.

:3. A-machine for treating grass in con- 'nectiongwith paper making comprising two shafts, a pluralityof double-edged toothed circular. knives and intermediate spacing .collars detachably andslidably mounted on each shaft but constrained to rotate with their, respective shafts, the knives on :one shafti'over-lappingthe knives on the other shaft so as tor-cooperate facially' therewith as shearsto cut the grass, ,means on each shaft at opposite-ends for'limiting the axial movement of; the knives thereon, means for laterally adjusting at least one of said shafts and means for clearing the spaces between the jknives,

comprising rotary v clearers, mounted beloweaehknife shaft, having ta pered forwardly eurved arm's arranged to enterthe. spaces between the knives to the full depth thereof, the arms of theadjacent .clearers overlapping, as set forth..

v4. A machine vfor treating grass in connection with paper maklng comprising two shafts, double-edged toothed circular knives and intermediate spacing collars detachahly mounted on each shaft to rotate therewith, the knives on one shaft overlapping the knives on the other shaft so as to co-operate as shears to cut the grass, means for driving at least one of the shafts and rotary clearers operably arranged to clear the spaces between the knives, comprising rotary clearers, mounted below each knife shaft, having tapered forwardly curved arms arranged to enter the spaces between the knives to the. full depth thereof, the arms of the adjacent clcarers overlapping, as set forth.

5. A machine for treating grass in connection with paper making comprising two shafts, a plurality of double-edged toothed knives and intermediate spacing collars detachably and slidably mounted. on each shaft and constrained to rotate therewith, the knives on one shaft over-lapping the knives on the other shaft so as to co-operate facially as shears to cut the grass, means on each shaft at opposite ends for limiting the axial movement of the knives thereon, means for adjusting one of said shafts axially, means for driving the other of said shafts, .a clearer shaft mounted below each knife shaft, tapered forwardly curved clearer arms mounted on each clearer shaft arranged to enter to the full depth thereof the spaces between the knives on the shaft innnediatrly above, the clearer arms on the adjacent shafts overlapping, and means for driving said clearer shafts, as set forth.

In testimony whereof I have signed my name to this specification.

SAMUEL MILNE. 

